How is 5-(2-Hydroxyethoxy)-2-(3-hydroxy-4-methoxyphenyl)-4-oxo-4H-chromen-7-yl 6-O-(6-deoxy-alpha-L-mannopyranosyl)-beta-D-glucopyranoside (CAS: 115960-14-0) typically synthesized?

This compound is typically synthesized via a multi-step process involving coupling reactions and glycosylation. The key steps include the preparation of the chromone derivative, followed by the formation of the glycosidic bond using a suitable glycosyl acceptor in the presence of a catalyst like tetrabutylammonium perchlorate. The overall yield is moderate, around 50-70%, with high selectivity for the desired product.